         <form>
			<h2>用户登录</h2>
		  <div class="form-group">
		    <label for="exampleInputEmail1"></label>
		    <input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp">
		    <small id="emailHelp" class="form-text text-muted"></small>
		  </div>
		  <div class="form-group">
		    <label for="exampleInputPassword1"></label>
		    <input type="password" class="form-control" id="exampleInputPassword1">
		  </div>
		  <div class="form-group form-check">
		    <input type="checkbox" class="form-check-input" id="exampleCheck1">
		    <label class="form-check-label" for="exampleCheck1">Remember me</label>
		  </div>
		  <button type="submit" class="btn btn-primary">登录</button>
		  <pre>   </pre>
  		  <div class="form-group form-check">
		    <label class="form-check-label" for="exampleCheck1">&copy; 2007-2022</label>
		  </div>
		</form>